beremiz

Update README for WAMP example to use crossbar with python3

2018-08-16, Andrey Skvortsov
cf0934b42d66
Update README for WAMP example to use crossbar with python3

crossbar python2 support is broken in v18.7.2.
I've submitted with fixes for that.
https://github.com/crossbario/crossbar/pull/1376

But they don't test crossbar with python2 in CI, so it's going to be
broken again in the future.
And there is no much reason to use crossbar with python2.
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# See COPYING.Runtime file for copyrights details.
#
from __future__ import absolute_import
from ctypes import CDLL, RTLD_GLOBAL, pointer, c_int, POINTER, c_char, create_string_buffer
def TryPreloadXenomai():
"""
Xenomai 3 (at least for version <= 3.0.6) do not handle properly dlclose
of shared objects whose dlopen did trigger xenomai_init.
As a workaround, this pre-loads xenomai libraries that need to be
initialized and call xenomai_init once for all.
Xenomai auto init of libs MUST be disabled (see --auto-init-solib in xeno-config)
"""
try:
for name in ["cobalt", "modechk", "copperplate", "alchemy"]:
globals()[name] = CDLL("lib"+name+".so", mode=RTLD_GLOBAL)
cobalt.xenomai_init(pointer(c_int(0)), pointer((POINTER(c_char)*2)(create_string_buffer("prog_name"), None)))
except Exception:
pass